Tuff Country 16990KN 6" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks
Tuff Country
16990KN
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Limited Lifetime Warranty
Made in the USA
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Tuff Country 16990KN 6" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks
Product Details
Description
Upgrade your 4WD Chevy Silverado 3500 or GMC Sierra 3500 with confidence using the Tuff Country 16990KN 6" Lift Kit with Knuckles and 1 Piece Sub-Frame with SX8000 Shocks. This bolt-on system is engineered to deliver dramatic height while preserving ride quality and durability, backed by a limited lifetime warranty.
- Front Lift Height: 6" front lift for enhanced ground clearance and improved off-road stance.
- Rear Lift Height: 4" rear lift to maintain a balanced, level look and performance.
- Shocks Included: 4 SX8000 shocks included for consistent damping across on-road and trail surfaces.
- Knuckles: New steering knuckles that eliminate the need to drop upper control arms, preserving steering geometry.
- Sub-Frame: 1-piece sub-frame designed for easier installation and solid front-end rigidity.
- Comprehensive Hardware Kit: Differential drop brackets, torsion bar drop brackets, axle spacers, carrier bearing drop kit, transfer case shims, U-bolts, brake line relocating kit, and all required mounting hardware.
- Additional Components: Lateral compression arms and mounts included to maintain alignment and steering feel.
- Tire Compatibility: Allows use of up to 36" x 12.5" tires for aggressive off-road capability.
- Finish: Black powder coat finish for durability and corrosion resistance.
- Installation: Simple bolt-on installation with an average time of 8–10 hours.
- Warranty: Backed by Tuff Country’s limited lifetime warranty for long-term peace of mind.
- Notes: Exhaust modification may be required on gas engines; factory rims will not fit with this lift kit; rim backspacing must be 4.5" or less (new rims required); Not compatible with dually models.
The 16990KN kit is built to keep your truck performing as it did from the factory—only higher. The multi-piece sub-frame simplifies the install, while the new knuckles help maintain precise steering and reliable handling across rocks, gravel, and highway miles. With rugged hardware and the included SX8000 shocks, you’ll experience a controlled, confident ride that’s ready for both daily driving and weekend adventures.
| Position | Front and Rear |
|---|---|
| Drivetrain | 4WD |
| Color/Finish | Black Powder Coat |
| Front Lift Height | 6" |
| Rear Lift Height | 4" |
| Rim Backspacing | 4.5" or less(requires new rims) |
| Year Range | Make | Model | Drivetrain | Fitment Note |
|---|---|---|---|---|
| 2001-2006 | Chevy | Silverado 3500 | 4WD | Will Not Fit Dually Models. |
| 2001-2006 | GMC | Sierra 3500 | 4WD | Will not fit dually model |
Specifications:
Packaging Details
FAQs
Please read our FAQs page to find out more.
Will this part fit my vehicle?
Fitment varies by year, make, model, drivetrain, and lift height. Always use the vehicle fitment selector or refer to the fitment notes on the product page before purchasing. If you’re unsure, our team can help confirm compatibility.
Are Tuff Country products street legal?
Most Tuff Country products are designed for on-road and off-road use, but local laws and regulations vary by state and country. It is the customer’s responsibility to ensure compliance with local vehicle regulations after installation.
Is professional installation required?
Professional installation is recommended but not required. Many products can be installed by experienced DIYers with proper tools. However, improper installation can affect ride quality, safety, and warranty coverage.
Will this affect my ride quality?
Tuff Country products are engineered to balance ride comfort, performance, and durability. Ride quality can change depending on lift height, vehicle setup, tire size, and other suspension components.
Are Tuff Country products covered by a warranty?
Yes. Tuff Country products are backed by a manufacturer warranty that covers defects in materials and workmanship. Warranty terms vary by product type and do not cover damage caused by misuse, improper installation, or normal wear.
Can I run larger tires with this product?
Many Tuff Country lift kits and suspension components allow for larger tire sizes, but maximum tire clearance depends on wheel offset, tire width, and vehicle configuration. Refer to the product details or contact support for guidance.
What is the return policy?
Unused, uninstalled products may be eligible for return within the stated return window. Items must be in new condition and returned in original packaging. Shipping costs and restocking fees may apply.
Who can I contact if I have questions?
Our customer support team is available to help with fitment questions, installation guidance, and order support. Reach out before purchasing if you want to ensure you’re selecting the right part for your build.
Free shipping on Orders Over $75
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Selling Suspension Systems for 35+ Years
Tuff Country EZ-Ride Suspension was incorporated over 35 years ago, realizing the desperate need for quality suspension products in the after market world.